#include "vbo/vbo.h"
+#define USE_BITMAP_ATLAS 1
+
+
/**
* Other parts of Mesa (such as the VBO module) can plug into the display
void mesa_print_display_list(GLuint list);
+/**
+ * Does the given display list only contain a single glBitmap call?
+ */
+static bool
+is_bitmap_list(const struct gl_display_list *dlist)
+{
+ const Node *n = dlist->Head;
+ if (n[0].opcode == OPCODE_BITMAP) {
+ n += InstSize[OPCODE_BITMAP];
+ if (n[0].opcode == OPCODE_END_OF_LIST)
+ return true;
+ }
+ return false;
+}
+
+
+/**
+ * Is the given display list an empty list?
+ */
+static bool
+is_empty_list(const struct gl_display_list *dlist)
+{
+ const Node *n = dlist->Head;
+ return n[0].opcode == OPCODE_END_OF_LIST;
+}
+
+
+/**
+ * Delete/free a gl_bitmap_atlas. Called during context tear-down.
+ */
+void
+_mesa_delete_bitmap_atlas(struct gl_context *ctx, struct gl_bitmap_atlas *atlas)
+{
+ if (atlas->texObj) {
+ ctx->Driver.DeleteTexture(ctx, atlas->texObj);
+ }
+ free(atlas->glyphs);
+}
+
+
+/**
+ * Lookup a gl_bitmap_atlas by listBase ID.
+ */
+static struct gl_bitmap_atlas *
+lookup_bitmap_atlas(struct gl_context *ctx, GLuint listBase)
+{
+ struct gl_bitmap_atlas *atlas;
+
+ assert(listBase > 0);
+ atlas = _mesa_HashLookup(ctx->Shared->BitmapAtlas, listBase);
+ return atlas;
+}
+
+
+/**
+ * Create new bitmap atlas and insert into hash table.
+ */
+static struct gl_bitmap_atlas *
+alloc_bitmap_atlas(struct gl_context *ctx, GLuint listBase)
+{
+ struct gl_bitmap_atlas *atlas;
+
+ assert(listBase > 0);
+ assert(_mesa_HashLookup(ctx->Shared->BitmapAtlas, listBase) == NULL);
+
+ atlas = calloc(1, sizeof(*atlas));
+ if (atlas) {
+ _mesa_HashInsert(ctx->Shared->BitmapAtlas, listBase, atlas);
+ }
+
+ return atlas;
+}
+
+
+/**
+ * Try to build a bitmap atlas. This involves examining a sequence of
+ * display lists which contain glBitmap commands and putting the bitmap
+ * images into a texture map (the atlas).
+ * If we succeed, gl_bitmap_atlas::complete will be set to true.
+ * If we fail, gl_bitmap_atlas::incomplete will be set to true.
+ */
+static void
+build_bitmap_atlas(struct gl_context *ctx, struct gl_bitmap_atlas *atlas,
+ GLuint listBase)
+{
+ unsigned i, row_height = 0, xpos = 0, ypos = 0;
+ GLubyte *map;
+ GLint map_stride;
+
+ assert(atlas);
+ assert(!atlas->complete);
+ assert(atlas->numBitmaps > 0);
+
+ /* We use a rectangle texture (non-normalized coords) for the atlas */
+ assert(ctx->Extensions.NV_texture_rectangle);
+ assert(ctx->Const.MaxTextureRectSize >= 1024);
+
+ atlas->texWidth = 1024;
+ atlas->texHeight = 0; /* determined below */
+
+ atlas->glyphs = malloc(atlas->numBitmaps * sizeof(atlas->glyphs[0]));
+ if (!atlas->glyphs) {
+ /* give up */
+ atlas->incomplete = true;
+ return;
+ }
+
+ /* Loop over the display lists. They should all contain a single glBitmap
+ * call. If not, bail out. Also, compute the position and sizes of each
+ * bitmap in the atlas to determine the texture atlas size.
+ */
+ for (i = 0; i < atlas->numBitmaps; i++) {
+ const struct gl_display_list *list = _mesa_lookup_list(ctx, listBase + i);
+ const Node *n;
+ struct gl_bitmap_glyph *g = &atlas->glyphs[i];
+ unsigned bitmap_width, bitmap_height;
+ float bitmap_xmove, bitmap_ymove, bitmap_xorig, bitmap_yorig;
+
+ if (!list || is_empty_list(list)) {
+ /* stop here */
+ atlas->numBitmaps = i;
+ break;
+ }
+
+ if (!is_bitmap_list(list)) {
+ /* This list does not contain exactly one glBitmap command. Give up. */
+ atlas->incomplete = true;
+ return;
+ }
+
+ /* get bitmap info from the display list command */
+ n = list->Head;
+ assert(n[0].opcode == OPCODE_BITMAP);
+ bitmap_width = n[1].i;
+ bitmap_height = n[2].i;
+ bitmap_xorig = n[3].f;
+ bitmap_yorig = n[4].f;
+ bitmap_xmove = n[5].f;
+ bitmap_ymove = n[6].f;
+
+ if (xpos + bitmap_width > atlas->texWidth) {
+ /* advance to the next row of the texture */
+ xpos = 0;
+ ypos += row_height;
+ row_height = 0;
+ }
+
+ /* save the bitmap's position in the atlas */
+ g->x = xpos;
+ g->y = ypos;
+ g->w = bitmap_width;
+ g->h = bitmap_height;
+ g->xorig = bitmap_xorig;
+ g->yorig = bitmap_yorig;
+ g->xmove = bitmap_xmove;
+ g->ymove = bitmap_ymove;
+
+ xpos += bitmap_width;
+
+ /* keep track of tallest bitmap in the row */
+ row_height = MAX2(row_height, bitmap_height);
+ }
+
+ /* Now we know the texture height */
+ atlas->texHeight = ypos + row_height;
+
+ if (atlas->texHeight == 0) {
+ /* no glyphs found, give up */
+ goto fail;
+ }
+ else if (atlas->texHeight > ctx->Const.MaxTextureRectSize) {
+ /* too large, give up */
+ goto fail;
+ }
+
+ /* Create atlas texture (texture ID is irrelevant) */
+ atlas->texObj = ctx->Driver.NewTextureObject(ctx, 999, GL_TEXTURE_RECTANGLE);
+ if (!atlas->texObj) {
+ goto out_of_memory;
+ }
+
+ atlas->texObj->Sampler.MinFilter = GL_NEAREST;
+ atlas->texObj->Sampler.MagFilter = GL_NEAREST;
+ atlas->texObj->MaxLevel = 0;
+ atlas->texObj->Immutable = GL_TRUE;
+
+ atlas->texImage = _mesa_get_tex_image(ctx, atlas->texObj,
+ GL_TEXTURE_RECTANGLE, 0);
+ if (!atlas->texImage) {
+ goto out_of_memory;
+ }
+
+ _mesa_init_teximage_fields(ctx, atlas->texImage,
+ atlas->texWidth, atlas->texHeight, 1, 0,
+ GL_ALPHA, MESA_FORMAT_A_UNORM8);
+
+ /* alloc image storage */
+ if (!ctx->Driver.AllocTextureImageBuffer(ctx, atlas->texImage)) {
+ goto out_of_memory;
+ }
+
+ /* map teximage, load with bitmap glyphs */
+ ctx->Driver.MapTextureImage(ctx, atlas->texImage, 0,
+ 0, 0, atlas->texWidth, atlas->texHeight,
+ GL_MAP_WRITE_BIT, &map, &map_stride);
+ if (!map) {
+ goto out_of_memory;
+ }
+
+ /* Background/clear pixels are 0xff, foreground/set pixels are 0x0 */
+ memset(map, 0xff, map_stride * atlas->texHeight);
+
+ for (i = 0; i < atlas->numBitmaps; i++) {
+ const struct gl_display_list *list = _mesa_lookup_list(ctx, listBase + i);
+ const Node *n = list->Head;
+
+ assert(n[0].opcode == OPCODE_BITMAP ||
+ n[0].opcode == OPCODE_END_OF_LIST);
+
+ if (n[0].opcode == OPCODE_BITMAP) {
+ unsigned bitmap_width = n[1].i;
+ unsigned bitmap_height = n[2].i;
+ unsigned xpos = atlas->glyphs[i].x;
+ unsigned ypos = atlas->glyphs[i].y;
+ const void *bitmap_image = get_pointer(&n[7]);
+
+ assert(atlas->glyphs[i].w == bitmap_width);
+ assert(atlas->glyphs[i].h == bitmap_height);
+
+ /* put the bitmap image into the texture image */
+ _mesa_expand_bitmap(bitmap_width, bitmap_height,
+ &ctx->DefaultPacking, bitmap_image,
+ map + map_stride * ypos + xpos, /* dest addr */
+ map_stride, 0x0);
+ }
+ }
+
+ ctx->Driver.UnmapTextureImage(ctx, atlas->texImage, 0);
+
+ atlas->complete = true;
+
+ return;
+
+out_of_memory:
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "Display list bitmap atlas");
+fail:
+ if (atlas->texObj) {
+ ctx->Driver.DeleteTexture(ctx, atlas->texObj);
+ }
+ free(atlas->glyphs);
+ atlas->glyphs = NULL;
+ atlas->incomplete = true;
+}
+
+
/**
* Allocate a gl_display_list object with an initial block of storage.
* \param count how many display list nodes/tokens to allocate
}
+/**
+ * Called by _mesa_HashWalk() to check if a display list which is being
+ * deleted belongs to a bitmap texture atlas.
+ */
+static void
+check_atlas_for_deleted_list(GLuint atlas_id, void *data, void *userData)
+{
+ struct gl_bitmap_atlas *atlas = (struct gl_bitmap_atlas *) data;
+ GLuint list_id = *((GLuint *) userData); /* the list being deleted */
+
+ /* See if the list_id falls in the range contained in this texture atlas */
+ if (atlas->complete &&
+ list_id >= atlas_id &&
+ list_id < atlas_id + atlas->numBitmaps) {
+ /* Mark the atlas as incomplete so it doesn't get used. But don't
+ * delete it yet since we don't want to try to recreate it in the next
+ * glCallLists.
+ */
+ atlas->complete = false;
+ atlas->incomplete = true;
+ }
+}
+
+
/**
* Destroy a display list and remove from hash table.
* \param list - display list number
if (!dlist)
return;
+ if (is_bitmap_list(dlist)) {
+ /* If we're destroying a simple glBitmap display list, there's a
+ * chance that we're destroying a bitmap image that's in a texture
+ * atlas. Examine all atlases to see if that's the case. There's
+ * usually few (if any) atlases so this isn't expensive.
+ */
+ _mesa_HashWalk(ctx->Shared->BitmapAtlas,
+ check_atlas_for_deleted_list, &list);
+ }
+
_mesa_delete_list(ctx, dlist);
_mesa_HashRemove(ctx->Shared->DisplayList, list);
}
_mesa_error(ctx, GL_INVALID_VALUE, "glDeleteLists");
return;
}
+
+ if (range > 1) {
+ /* We may be deleting a set of bitmap lists. See if there's a
+ * bitmap atlas to free.
+ */
+ struct gl_bitmap_atlas *atlas = lookup_bitmap_atlas(ctx, list);
+ if (atlas) {
+ _mesa_delete_bitmap_atlas(ctx, atlas);
+ _mesa_HashRemove(ctx->Shared->BitmapAtlas, list);
+ }
+ }
+
for (i = list; i < list + range; i++) {
destroy_list(ctx, i);
}
}
}
+ if (USE_BITMAP_ATLAS &&
+ range > 16 &&
+ ctx->Driver.DrawAtlasBitmaps) {
+ /* "range > 16" is a rough heuristic to guess when glGenLists might be
+ * used to allocate display lists for glXUseXFont or wglUseFontBitmaps.
+ * Create the empty atlas now.
+ */
+ struct gl_bitmap_atlas *atlas = lookup_bitmap_atlas(ctx, base);
+ if (!atlas) {
+ atlas = alloc_bitmap_atlas(ctx, base);
+ }
+ if (atlas) {
+ /* Atlas _should_ be new/empty now, but clobbering is OK */
+ assert(atlas->numBitmaps == 0);
+ atlas->numBitmaps = range;
+ }
+ }
+
mtx_unlock(&ctx->Shared->Mutex);
return base;
}
+/**
+ * Try to execute a glCallLists() command where the display lists contain
+ * glBitmap commands with a texture atlas.
+ * \return true for success, false otherwise
+ */
+static bool
+render_bitmap_atlas(struct gl_context *ctx, GLsizei n, GLenum type,
+ const void *lists)
+{
+ struct gl_bitmap_atlas *atlas;
+ int i;
+
+ if (!USE_BITMAP_ATLAS ||
+ !ctx->Current.RasterPosValid ||
+ ctx->List.ListBase == 0 ||
+ type != GL_UNSIGNED_BYTE ||
+ !ctx->Driver.DrawAtlasBitmaps) {
+ /* unsupported */
+ return false;
+ }
+
+ atlas = lookup_bitmap_atlas(ctx, ctx->List.ListBase);
+
+ if (!atlas) {
+ /* Even if glGenLists wasn't called, we can still try to create
+ * the atlas now.
+ */
+ atlas = alloc_bitmap_atlas(ctx, ctx->List.ListBase);
+ }
+
+ if (atlas && !atlas->complete && !atlas->incomplete) {
+ /* Try to build the bitmap atlas now.
+ * If the atlas was created in glGenLists, we'll have recorded the
+ * number of lists (bitmaps). Otherwise, take a guess at 256.
+ */
+ if (atlas->numBitmaps == 0)
+ atlas->numBitmaps = 256;
+ build_bitmap_atlas(ctx, atlas, ctx->List.ListBase);
+ }
+
+ if (!atlas || !atlas->complete) {
+ return false;
+ }
+
+ /* check that all display list IDs are in the atlas */
+ for (i = 0; i < n; i++) {
+ const GLubyte *ids = (const GLubyte *) lists;
+
+ if (ids[i] >= atlas->numBitmaps) {
+ return false;
+ }
+ }
+
+ ctx->Driver.DrawAtlasBitmaps(ctx, atlas, n, (const GLubyte *) lists);
+
+ return true;
+}
+
+
/**
* Execute glCallLists: call multiple display lists.
*/
return;
}
+ if (render_bitmap_atlas(ctx, n, type, lists)) {
+ return;
+ }
+
/* Save the CompileFlag status, turn it off, execute display list,
* and restore the CompileFlag.
*/
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